Comparative Pharmacology
Head-to-head clinical analysis: ACIPHEX versus PREVACID 24 HR.
Peer-Reviewed Evidence
Head-to-head clinical analysis: ACIPHEX versus PREVACID 24 HR.
ACIPHEX vs PREVACID 24 HR
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Rabeprazole is a proton pump inhibitor that suppresses gastric acid secretion by specific inhibition of the H+/K+ ATPase enzyme system at the secretory surface of gastric parietal cells.
Proton pump inhibitor (PPI) that irreversibly inhibits the H+/K+-ATPase enzyme system (proton pump) at the secretory surface of gastric parietal cells, suppressing basal and stimulated gastric acid secretion.
20 mg orally once daily; duration: 4-8 weeks for erosive esophagitis, 4 weeks for GERD, 24 weeks for H. pylori eradication (triple therapy: AcipHex 20 mg + amoxicillin 1000 mg + clarithromycin 500 mg twice daily for 7 days), 4 weeks for duodenal ulcer, up to 12 months for pathological hypersecretory conditions.
15 mg orally once daily for 14 days.
None Documented
None Documented
Plasma half-life 1-2 hours, but pharmacodynamic half-life (acid suppression) >24 hours due to accumulation in parietal cell canaliculi.
1.2-1.5 hours in healthy subjects; no accumulation with once-daily dosing.
Hepatic metabolism, primarily via CYP2C19 and CYP3A4; ~90% eliminated as metabolites in urine, <1% unchanged; remainder in feces.
Approximately 66% renal (as metabolites), 33% fecal (primarily biliary); less than 1% unchanged in urine.
Category C
Category C
Proton Pump Inhibitor
Proton Pump Inhibitor